Leather-sewing machine.



L. ROSENTHAL.

LEATHER SEWING MACHINE.

APPLICATION FILED AUG.14, 1913.

1,085,487. Patented Jan. 27, 1914.

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UNITED STATES PATENT OFFICE.

LOUIS ROSENTI-IAL, OF FRANKFORT, GERMANY.

LEATHER-SEWING MACHINE.

To all whom it may concern: 1

Be it known that I, LOUIS RosnN'rHAL a subject of the King of Prussia, residing at Frankfort, Germany, have invented new and useful Improvements in Leather- Sewing Machines, of which the following is a specification.

This invention relates to the operating mechanism of machines chiefly designed for sewing boots and shoes, such machines being of the type wherein the several parts have heretofore been actuated through a slide that is reciprocated rectilinearly by means of a connecting rod from a crank to which a rotary motion is imparted.

According to the present invention, a rotary driving shaft is mounted on the machine-frame and from this shaft the needleslide and the shuttle are actuated through separate sets of crank or like connections. By this means, adjustment of these separately driven parts is facilitated and a more durable construction is rendered possible.

a This invention will now be described with reference to the accompanying drawings in which:

Figure l is a plan view of a boot and shoe sewing machine showing one form of the improved operating mechanism. Fig. 2 is a section on the line -A-B of Fig. 1 looking in the direction of the arrow P. Fig. 3 is a sect-ion on the line C-D of Fig. 1 also looking in the direction of the arrow P. Fig. a is a planview of a sewing machine showing a modified form of operating mechanism, and Fig. 5 shows in side elevation and on a smaller scale a pedestal for supporting the machine shown in Fig. 4.

The bed a of themachine which may be hinged at a to a bench or the like has in a guide 7) the needle slide (Z carrying the needle f. This guide is also furnished with a work presser having the presser foot 6, which presses the boot or shoe to be sewn against the wall of the shuttle housing h in which is situated the shuttle g. A main driving shaft 0 having two cranks 0, .0 and a hand-wheel 7: is mounted in bearings carried on the bed plate a and is situated parallel to the longitudinal axis of the needle. The crank 0 is operatively connected to the needle-slide d by a link i and a bell crank lever 1'. which is pivotally mounted on the bed plate, while the crank 0 is operatively connected by means of a link m to a toothed segment m which is pivotally mounted at z Specification of Letters Patent.

Application filed. August 14 Patented Jan. 27,1914.

, 1913. Serial No. 784,813.

on the housing 71. and which meshes with a 'gear n mounted on the shuttle shaft. A

work feeder 1" is mounted on the pivot 20 which is arranged eccentric to the pivot a. The usual heating device '0 is provided for warming the pitch or wax thread.

It will be appreciated that by simply rotating the driving shaft 0 by means of the hand wheel 70 the crank 0 will reciprocate the needle slide and the crank 0 will oscillate the shuttle and also operate the work feeder 7.

In the modified form of driving mechanism illustrated in Fig. 4 the driving shaft is mounted'at right angles to the longitudinal axis of the needle f and carries two eccentrics one of which reciprocates the needle shaft by means of the eccentric strap 6 and link 27 while the other oscillates a cam a, which is pivotally mounted on the bed-plate, by means of the eccentric strap t and link m The toothed segment at has an extension or wiper which is kept in contact with the cam by means of a spring 3 and it will be seen that the movement of the cam will cause the said segment m and the shuttle g to oscillate. The handwheel la is arranged at the end of the bed-plate and is connected to the shaft 0 by bevel gearing is.

To enable the height of the bed plate a to be adjusted it is provided with a pillar Z that fits within a socket a and has a series of transverse holes at difi'erent levels. A. pin q can be passed transversely through a hole in the socket a and any one of the holes in the pillar Z.

Obviously if desired the driving shaft 0 may berotated by means of a pedal connection therewith, instead of by a handwheel.

hat I claim is 1. In a leather stitching machine, the combination of a bed provided with a horizontal guide; a needle-slide mounted for horizontal movement in said guide; a rotary drive shaft mounted horizontally upon said bed; a shuttle; a vertically-arranged shuttle shaft; a housing wherein the shuttle is disposed; a work presser mounted horizontally in said guide and having a presser foot operative to hold the work against the adjacent vertical wall of said housing; an oscillatory gear segment pivotally mounted on said housing; a gear on the shuttle shaft in mesh with said segment; connections between the drive shaft and said segment for operating the latter from the former; and

connections between the needle-slide and said CiI 'iVB 'Shfifb for reciprocating said needle-slide during the rotation of thedrive shaft. I

2. In a leather stitching machine, the combination of a bed; a needle-slide; a rotary drive shaft: a shuttle; a shuttle shaft; an-

oscillatoi'yt'gear segment provided: With a wiper; a gear on the shuttle shaft in mesh with said segment; a rotatably-ihounted cam engaged with the Wiper on said segment for operating the latter; a spring connected to -saad -wlper for holding-the same contlnu- ---ous1y in such engagement; a palr of eccentries mounted'oni'the drive shaft; a rod connecting one of said eccentrics and said cam; andmuconnection between the other eccentric M and said needle-slide.

n LOUIS ROSENTHAL.

Witnesses JEAN GRUND, CARL GRUND.

Copies of this patent may be obtained-for five cents each, by addressing the Commissioner of Patents, 

